Ottawa Transportation Commission was the public transit operator for the Canadian city of Ottawa from 1948 until the creation of OC Transpo in 1973.
In December 1950 the OTC gained control and ownership of the Eastview Bus Service and absorbed all bus lines, buses and the garage.
Trolley Bus operation began December 15, 1951 Using overhead wires left over from the streetcar system, with buses being exclusively used along the former Bronson line. Service ran until June 27, 1959 when it was replaced by diesel buses and overhead wires were removed. The buses were sold to the Toronto and Kitchener
OTC took over streetcar operations from the Ottawa Electric Railway, but they were gradually abandoned for trolley bus and bus operations. Some streetcars were sold to the Toronto Transit Commission. the service ran until May 1, 1959 with tracks and wires being removed shortly after. wires along Bronson Ave remained as the OTC begain trolley bus operation.